I have a basic HTML form which is a table with four fields on either side. Each field has three values: comment, date, sameas

What I am trying to figure out is getting those "same as" menus to populate data into the corresponding field. ie: A user enters a date and comment at Right3 and chooses "Same as Left2," the date, comment and sameas values are automatically populated at Left2.

I am a novice at javascript, but if someone could push me in the right direction, I'd appreciate it.

Edit: I have figured out how to populate the text areas thanks to your code snippets.
Here is the result so far